  public function executeCartIndex(sfWebRequest $request)
  {
    // sorting
    if ($request->getParameter('sort'))
    {
      $this->setCartSort(array($request->getParameter('sort'), $request->getParameter('sort_type')));
    }

    // pager
    if ($request->getParameter('page'))
    {
      $this->setCartPage($request->getParameter('page'));
    }

    $this->cartMerge();
    $this->pager = $this->getCartPager();
    $this->sort = $this->getCartSort();
    $this->cart_objects = $this->configuration->getCartItemsAsObjects();
  }
